Sandal upper



FIG. 1 is a perspective view of a sandal upper showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevation view of one side thereof;

FIG. 4 is a side elevation view of the other side thereof;

FIG. 5 is a front elevation view thereof; and,

FIG. 6 is a rear elevation view thereof.

The broken line showing of the shoe sole in the figures is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for the sandal upper, as shown and described. 